I'm not a big country guy, but will listen to most other things. This may sound odd but when it comes to hated music, if I have a really bad concert experience with a band, I hate them forever more because their music reminds me of the terrible show I paid money to see.
So far, the only two bands to hold this honor are:
Guns N' Roses - Jackwagon Axl never showed up for the concert, so the audience (a bunch of 80's biker-type people, mind you) spent close to three hours listening to CKY and Mix Master Mike form the Beastie Boys before they announced that the show was cancelled. There was a Riot in the Stadium. Good times.
The Who - Sacrilege? Maybe, but the show I went to, I had the misfortune of sitting behind some guy that was either drunk or on some sort of drug. He spent the ENTIRE show swaying around and tone-deaf singing every song from beginning to end, which sucks because they played Tommy in its entirety. I now can't listen to this band without thinking of that